Workbook 3B [Text] : Seoul National University / Y. Chung H. Kim E. Choi J. Kim ; [Translator R. Carrubba] ; Seoul National University ; Language Education Institute... – Seoul : Twoponds Co, 2015. - 215 p., ill.;+ 1 CD . - Text in Korean and English . . – [n. c.] – 978-89-539-3445-0 : 50 tg., – 978-89-539-3908-0
Workbook 3A [Text] : Seoul National University / E. Choi Y. Chung H. Kim J. Kim ; [Translator R. Carrubba] ; Seoul National University ; Language Education Institute... – Seoul : Twoponds Co, 2015. - 219 p., ill.;+ 1 CD . - Text in Korean and English . . – [n. c.] – 978-89-539-3444-3 : 60 tg., – 978-89-539-3908-0